* {
    font-family: monospace, arial, sans-serif;
}

legend {
    font-weight: 900;
    margin-bottom: .1em;
}

body, button {
    font-size: 30px;
    line-height: 30px;
}

.toggle-button { background-color: lightgray; margin: 5px 0; border-radius: 20px; border: 2px solid #D0D0D0; height: 24px; cursor: pointer; width: 50px; position: relative; display: inline-block; user-select: none; -webkit-user-select: none; -ms-user-select: none; -moz-user-select: none; vertical-align: middle; }
.toggle-button button { cursor: pointer; outline: 0; display:block; position: absolute; left: 0; top: 0; border-radius: 100%; width: 30px; height: 30px; background-color: white; float: left; margin: -3px 0 0 -3px; border: 2px solid #D0D0D0; transition: left 0.3s; }
.toggle-button-selected { background-color: #83B152; border: 2px solid #7DA652; }
.toggle-button-selected button { left: 26px; top: 0; margin: 0; border: none; width: 24px; height: 24px; box-shadow: 0 0 4px rgba(0,0,0,0.1); }